SU1181130A1 - Controlled logical device - Google Patents

Abstract

CONTROLLED logic device comprising a digital item, whose inputs are inputs .kontroliruemogo logic device, each of which is connected to the input of the discriminator sootvetstvukntsego, total input power is connected to the common bus device positive power bus which is connected to the input power polszhitelnogo digital element, characterized by the fact that, in order to increase the reliability of the control, the OR element, the key and the display element are inserted into it, which is included between the key output, the cat is the output of the monitored logic device, and the common bus, which is w (L is connected to the common input of the key, the first and second inputs of which are connected respectively to the output of the digital element and the output of the SHSh element, information inputs of which are connected to the outputs of the discriminator, the power inputs of the element OR connected to the positive and negative power buses, respectively, which are connected to the corresponding inputs of the discriminators, and the negative power bus is also connected to the common digital input element.

Description

11 The invention relates to computer automation and electronics and can be used to create integrated circuits, digital blocks and systems with a high availability factor. . The purpose of the invention is to increase the availability of monitoring by detecting failures such as interruptions of inputs and short-circuit faults with a power bus, I FIG. 1 shows a block diagram of the device} in FIG. 2 - a trigger with a positive threshold “pores in FIG. 3, The negative trigger threshold in FIGS. 4 and 5 are the functional designations for Schmitt triggers with positive (+) and negative (-) thresholds for triggering, respectively; FIG. 6 is a functional diagram of a signal discriminator; FIG. 7 is a key diagram. The controlled logical device contains a digital element 1, the inputs of which are the inputs 2 of the controlled logical device, each of which is connected to the input of the corresponding discriminator 3, the common power input of which is connected to the common bus 4 of the device, the bus 5 of the positive power which is connected to the input positive power of the digital element, the element OR 6, the key 7 and the element 8 of the display, which is connected between the output of the key 7, which is the output 9 of the logic device being monitored, and the common bus 4, which is connected to the common input of the key 7, the first and second inputs of which are connected respectively to the output of the digital element 1 and the output of the OR element 6, whose information inputs are connected to the outputs of the discriminator 3, the power inputs of the SHSh 6 element are connected respectively to the positive 5 buses and negative 10 power supply, which are connected to the corresponding inputs of the discriminators 3, and the negative power bus 10 is also connected to the common input of the digital element 1, as a digital element 1, which implements some th binary function that can be taken that any known chip LSI or a digital unit. Typically, in chips, the level of the Log, O corresponds to the voltage. 302 close to zero (). and the level is Log, 1 is the voltage close to the supply voltage E of the microcircuits (). For operation of the device, different polarity levels of binary signals are used. This can be provided with power supply to conventional microcircuits, with a two-pole voltage E1 and E2 relative to the common bus so that (Elf + JE2 | E |. It is desirable that the threshold voltage levels corresponding to Log, 1 (and) and Log, O (Od a) the circuits with three states, differing in sign, were approximately the same, t, e, and, i. Thus, the circuit with three states feeds on the opposite voltage + E1 and -E2. It provides processing except for logical Signals 1 and O are also signified by denoted l / (tilde). Moreover, Log, 1 corresponds to voltage U. ((U4nop. and E,), signal lu Log, O - voltage (-E2 o Up pop), signal - voltage U (-UQ v-U l then) where and, n, p (VO-KOP) threshold levels voltage Log, 1 (0) The operation of a circuit with three states with one output and n inputs is reduced to the fact that it implements a certain function ff (xj, ,,,, Xj, ,,,, xn), and f 0 (1) if V хДх-t (0,1) 3 J; if x (x-), then f, the operation of the device with m outputs can be described by describing m circuits with three states with one output. The digital circuit with three states works as follows. If signals come to all inputs 2 of the device, the level of the stresses is equal to Log, O (U) or Log, 1 No. 4), then in this mode the signal discriminators do not work and the output of the OR 6 element has a signal that ensures the passage through the key 7 of the signal from the output of the digital element 1 to the output 9 of the device. This signal, in accordance with the function f, can have a voltage level U or U, And in fact, and in another case, the display element 8 (for example, a glow lamp) shows the correct functioning of the circuit with three states (the lamp is lit), If If at least one of the device inputs 2 a signal L appears (this is possible when some input 1 is jammed or if any input 2 is short-circuited with a common power supply bus 4), then the corresponding discriminator 3 signals and the voltage through the element 6 post on key 7 last zakrsha It separates the output of element 1 from the output 9 of the device. The display element 8 does not light up, which indicates the presence of failures in the device. Thus, if the device inputs 2 have signals of specified logic levels, then the logic level signal is also available at the device output, but if at least one circuit input has the signal A- then the same signal is set at the output of the device. For the device to function, it is necessary that, in the event that some of its inputs are interrupted, there is a signal at the same input. The discriminator 3 signals contain the famous Schmitt triggers, supplemented by a divider on resistors 11 and 12 and a zener diode 13 on the input. If the input of the flip-flops (Fig. 2 and 3) is interrupted, the voltage at their inputs is close to zero (logic signal). This is due to the fact that the zener diodes 13 are closed. In addition, the transistor 14 is closed, the transistor 15 is open, and the voltage at the output of the flip-flop corresponds to Log.O (FIG. 2). For the flip-flop shown in FIG. 3 when the input is broken, the transistor 14 is open, and the transistor 15 is closed, the output voltage corresponds to Log.1. The same state of the transistors of the trigger exists at any non-negative (positive) voltage for the trigger shown in FIG. 2 (FIG. 3), since the zener diodes 13 are closed. The stabilization voltage of the zener diodes is chosen based on the condition Uc, 5 1E2 (and, | Е1)). If the voltage at the trigger input (Fig. 2) exceeds the level of the U-lBob Zener diode 13 is open and the signal of Log 1 is set at the trigger output. If the voltage at the trigger input (Fig. 3) is below the Upfjop level, then the Zener diode 13 opens and at the trigger output, a Log.O signal is set. Setting the input voltage, at which Zener diode 13 opens, is achieved both by selecting its stabilization voltage and by selecting the parameters of resistor 11 and 12. Thus, the inputs of the proposed Schmitt triggers can be signals 1, Oh, v, and the outputs of t Only O and 1. The discriminator circuit (FIG. 6) consists of two Schmitt triggers and a logic element 16 of unequalities. The operation of the signal discriminator / v is presented in the following table. The key contains an optocoupler 17 and a power bridge of diodes. If the key Log input is not inputted as Log.1, the LED does not turn on, the phototransistor is locked, the key output is disabled. If the key Log goes to the input of the key. 1, then the LED illuminates, therefore, the phototransistor is open, the key is on.

10 h 5 5i

-tfiei

Output

 I

NSY

entrance

Fug.tf

H

Vlod

Output

0-f2

Fig-3

FIG. five

Output

16 b

Claims (1)

CONTROLLED LOGIC DEVICE containing a digital element, the inputs of which are inputs of a controlled logic device; each of which is connected to the input of the corresponding discriminator, the common power input of which is connected to the common bus of the device, the positive power bus of which is connected to the positive power input of the digital element, which differs the fact that, in order to increase the reliability of control, an OR element, a key, and an indication element are inserted into it, which is connected between the output of the key, which is is connected by the output of the controlled logic device, and by a common bus that is connected to a common input of the key, the first and second inputs of which are connected respectively to the output of the digital element and the output of the OR element, the information inputs of which are connected to the outputs of the discriminators, the power inputs of the OR element are connected respectively to the positive buses and negative power, which are connected to the respective inputs of the discriminators, and the negative power bus is also connected to the common input of the digital element. >